Pipe-coupling.



WITNESSES: 1

C. R. SCHMIDT. PIPE UGUPLING.

APPLIOATIOI mum 0012s, 1901.

924,840, Patented June15,1909. i SHEETS-BREE! 1.

a 25y 1.9 5/ Q INIZENTQR Amy;

UIIARLES It. SCHMIDT, 01" 'lML'IIMORE, MARYLAND.

PIPE-COUPLING.

Specification of Letters Patent.

Patented June 16, 1909.

Applicatlon filcd October 6, 1907. Serial No. 396,122.

To all wlwm it may concem:

Be it known that l, (humans-R. Scrmnrr, a citizon of tho Unitod Stat-cs, residing at Baltimore, State: of Mnrylai'id, have invented aorta-in now and usvful Improvements in Pipo-Oouplings, of which tho following is it specification.

This invention has rolction to pipc coup lings and relates particularly to couplings for cast iron pipes wherein the intoril'itting falicct and spigot ends are toporcxi and machined or ground to produce a tight joint.

My invontion has for its ob'oct the pro vision of novel means for producing a per- .fec-tly'tight 'oint in con dings of the c bovo mentioned 0. nractcr am in order to accomi. the desired result I so construct tho it mid. of ouch ipc scction as to rcndcr one elastic so t int it will yield undo! tho ntrcin'imposed upon. it by tho spigot end. or cntcring nicmhor of the adjacent pipe scction and ai'zcoinmodatc itself to inequality or unexactness in shapc of tho igot end, duo to imperfect workmnnshi and will also permit of adjacent sections 0 pipc hcing pr-rfoctly joined even though thoy arc laid somcwhct out of exact alin nicnt I producetho rcquircci elast-icity'of thcf'aucct section by onlarging tho bore of tho faucet scction adios cent to the tapered port-ion so its to diminish the thickness of the wolf of the faucet mombar and rcndcr the sonic oxpimsihlc and clastic to a sufficicnt dcgrcc to accomplish tho desired result.

A. further ('ihjcct of my invcntion is to ro vidc means for clcnring tho tool with W rich the machining or finishing of the tapered portion of the spigot mcmhcr is pcrformcd and for obviating hrcahagc at tho point Whore tho tapered surfcco of the f MIC-9t cnd niects thc flango of the couplii r and those last namcd ohjocts 1 iiccomp ish )3 providing a. concave groove back of tho tape-rod portion of tho spigot cnd tiJlil adjacent tho i nngc.

.lv havc illustrator! my lllVlIltlUl'l in the accompanyin drawing in which:

Figure 1 is it vortical longitudinal sectional view of a pipc'soction constructed according to my invention, the parts hcing scal'atvd. Fig. 2 is a similar view of the sonic, t c'pcrts being connected together. Fig. 3 is a transverse ai'ictional View on the line X-X cf Fig.

manner in which the elasticity so I. Fig. 4 is a similar view on tho lino Y-Y of Fig. I. Fig. is a vertical longitudinnl scctiomil vicw of a modified form of my in vcntion. Fig. (i is o simihir vicw of another modified form of he SELIIH.

Rei'crring first to Fips. I, 2, 3 and 4 in which dcsigmitcs tho .iody of tho pipe scction which carries tho taucot or rcciving mcmhcr of the coupling and which is rovidcd with the integral flangc 2, carrying ugs 3, having holes 4 for the rcce-ption of bolts 5,' by moans of which adjac nt soctions of pipe are con ilcd together.

The lingo 2 joins the. body 1 by it curved lino forming a concave corner which minimizes the danger of breakage at this point, The focus of the flange 2 and of the lugs 3 are licv'clod as shown at 6, this bevclod surfncc crgtonding from the outer edges of the lugs and flange to within ii short distance of the horc or cavity 7 in tho ccntcr of the fliingo, whi h bore or cavity constitutes tho faucct or rocciving portion of the couplin Tho horc or cavity 7 is former with an in wardly tnpcrcd surface 8 extending from the face of the hinge toward the contcr of the some and lmginninp at the inner edge. of the tapered surface B, the bore or cavity 7 is gradually enlarged and then diminished to tho sizc of the bore of the pipc on the revcrsc curved line 9, thereby forming an annular recess adjacent the tapered surface 8. This enlargement of the bore or cavity of the faucet section in the rear of the tapered portion provides the required elasticity for the mzcoi'nplislm'icnt of the first ohjcct hcrcinhcl'orc set forth and constitutes the most important feature of my invcntion and the )rovidcd is utilized in thc provision of a perfectly tight joint will be hereinafter described. Ina-ddition to thescouring bolts 5 I provide metallic clamps 15 which cnga. e by means of thcir inturnod cnds 16 with notches 17 fol-mod inthc out-or surfaces of lugs 18 that arc formod into ral with tho lugs'l'l, andwith corresponding ugs 18' having notches 1.7 corricd by tliictpntering oz' spigot member of the coupling.

The spigot or "cn-tgriwg nacn'ihcr 0f the cou ling is shown at the right in Figs. 1 and 2 of t e crowing, and 19 designates the body 60 (Soup of the pipe section and 21 a reinforcement thereof. The reinforcen'ient 21 carries lugs 22 and the roar surfaces of the lugs and the flange join the body of the pipe on a curved line and the faces of the reinforcement and the lugs are beveled as shown at 24 and the lugs are provided with holes 25 registering with the holes 4 in the lugs 3. The spigot end of the pi )0 section 19 is designated 26 and is provided as shown with an outer tapering surface 27 which is preferably formed at a sli htl more acute angle to the longitu ina axis of the pipe than the tapered surface 8 of the faucet section, and in the 16 rear of the tapered surface 27 I form a con cave groove 28 which merges gradually'into the beveled faces of the reinforcement 21 and, the lugs 22.

The groove 28 renders the spigot end 26 elastid and also rovides clearance for the tool used to mac ine or finish the beveled surface of the spigot end and also minimizes danger of breakage which would be liable to take place at the junction of the spigot end with the flange if the point of juncture was a sharp corner-or angle. In Order to give additional elasticity to the spigot or entering member of the coupling I form a concave annular groove 29 ili the wall of the bore of 30 this section, said groove being referably located somewhat farther from t e edge of the spigot end thanthe groove 18.

he parts as descri ed are preferably made of cast iron and when the adjacent ends of pipe sections are to be joined, the spigot end of one section is inserted in the faucet end of an adjacent section and bolts 5, are passed through the holes in the lugs of both sections and whenthe bolts are tightened up by screwing up the nuts with which they are provide( t e two sections are drawn tightlytogether and form a perfectly tight and water or gas psroof joint. If desired the clamps 15 are 0 applied as shown in Fig. 2 46 and serve to hold the members tightly togather in the event of the bolts failing to do so. In drawing the sections to ather the faucet section yields or ex an s slightly owing. to its elasticity so t at when the in operation is completed the spigot end will be tightly and snugly fitted in the faucetend, notwithstanding an slight irregularity that may exist in cit ier'scction and notwithstanding any slight deviation in 66 axial alinement of the two sections that may 5 of the drawing 1 have shown a modifie form of my present invention in which both members of the coupling are flo-faucet-or receiving members and in which I employ a double cone shaped ni iple or thin]; ble to, effect a tight joint. in the form shown in Fig. 5 both members of the coupling are precisely the same as the faucet or receiving member of the coupling shown in the several figures hereinbefore described and in order to produce a tight joint between these members I provide a nipple or thimble 350 which is of double-cone shape, having its external surface tapering inwardly from or near the center toward both ends as shown at 3], 31 in order to render the thimblc 30 elastic, I form the thimblc with an external groove 82 and an internal groove 33.

in Fig. 6 of the drauing I have shown another modified form of my invention in which both members of the coupling are faucet or receiving members and in which the double-cone shaped thimble 30 is employed to effect a tight joint between these two members, but this form of my invention is designed to render the improvement ap plicable to wrought iron pipes and I have 111 this figure shown the coupling members, which in the other figures are shown as formed integral with the ipe members, as separate parts formed wit. screw threaded bores for the reception of the screw threaded ends of wrought iron or steel pipes 32.

I have shown the bolts 5 as provided with suing washers 20, to provide the required egree of flexibility in the joint, as it has been fornd that where such elasticity is rovided the joint will permit of the usual ongitudinal expansion and contraction of the pipe sections without detriment to the integrity of the joint, the spigot end in one form or the thinible in the other form of the device slipping in and out of the tapered faucet section to the required degree and the elasticity of the faucet section servingto always preserve a tight joint during you after such movement.

I claim:

1. In a coupling for pipes, a coupling section having a tapered spigot end, in combination with a faucet section having a ta iered faucet o )ening to receive said spigot en the sections eing provided with means for drawing them together and the bore of the faucet section being enlarged adjacent the inner end of the tapered portion thereof and being snliicientl elastic at said enlargement to expand w ran the sections are drawn tightly together.

2. In a coupling for pipes the combination of a faucet section having a tapered opening with a spigot section having a tapered spigot end and a groove at the rear of the lie )ered portion of the spigot end on the outside of the same and a the spigot section.

3. in a coupling for pipes, the combination of an exterior tapered spigot section with an interiorly' tapered faucet section and means for drawing said sections together the bore of groove on the inner wall of the faucet section being enlarged at the rear of the tapered portion and being elastic at suchenlargement, the inner walls of the enlarged portaen being formed on curved lines.

4. In a coupling for pipes the combination with faucet members of an elastic eouplin thimble having a groove in its inner welfi I said thimble being adapted to enter the faueet members.

In testimony whereof I have affixed my signature, in presence of two witnesses.

CHARLES R. SCHMIDT. Witnesses CLYDE B. WEIKERT, Tues. A. CONNOLLY. 

